Rotary valve



July 12, A1932. J. THQRKILDSEN ROTARY VALVE Filed Nov. 10, 1930 ,fr of rw Mn um mns/5555:

E Q g my M Patented July 12, 1932v UNITED STATES JOHAN THORKILDSEN, OF STAVANGER, NORWAY ROTARY VALVE Application led November 10, 1930, Serial No. 494,647, and in Norway June 8, 1929.

The present invention relates to rotary valves, more particularly for internal con1- bustion engines. It is known in connection with rotary vaives for internal combustion .L5 engines to make the valves of several axially alined sections corresponding to the number of cylinders served by the valve, the sections being detachably connected together at the ends. This end connection of the valve sections is preferably effected by providing the valve sections at one end with a groove preferablyofdovetailsectiomand at the other end with rib or projection of corresponding sec- 1 tion. In assembling the section members the sections are slid into one another, the rib or projection at the end of one section engaging the corresponding groove of the adjacent section. This arrangement also enables the sections to be easily detached when the valves are removed from the housings for careful inspection. The section elements are in this type of valve, usually provided with diametrically extending passages or ports for the supply of the explosive fuel mixture and for the discharge of the exhaust gases.

the provision of a diametrically extending exhaust passage the advantage is attained that as the exhaust gases pass in a straight line direct through the valve section into the exhaust tube, the valve section will be heated only to a very slight extent.

' It is the object of the present invention to improve the tightness of the joint between a valve section and the housing or valve seating in such a manner as to make the tightness and pressure between the valve and the surrounding seating or housing material as far aspossible independent of the temperature and the expansion caused by the rise of temperature. This object is, according to the invention, attained by making the valve sections elastic or resilient by the provision of one or more slots which extend from one side of an element alventing oil from entering the interior of the valve section and also inorder tov prevent leak-H ,Y age of gas, more particularlyexh'aust gas, from one element to an adjacent element. These insertion plates, which preferably extend .diametrically into thesections, must, of course, be provided with openings corre-Vl spending to the passage or ports provided inthe sections so as to enable the -fuel mixturev or the' exhaust gases to'pass through'the valve. I A j ,4 The accompanying drawingjsh'ows by way of example one vconstruction embodying thel features of the invention. f

- Fig. 1 isa-n axial section through a rotaryV valve Vhaving two valve sections andintended for use with a two-cylinder engine, and the adjacenty portions of the valve -seating orV housing; -Y A Fig. 2 is a section on line II-II offFig.` Il;V Fig. 3 is a section on line" III-III of Fig. l. ,y

Fig. 4 is a detail elevation of an insertion plate. l Y, Y

Fig. 5 is an end viewof a' valve section with the insertion plate, and v Fig. 6 is adetail end view of part of a valve'j operating gear.. Y Y j i Referring now to. the drawing and more j particularly to Fig. l, 3, 3f indicate two ad-v jacent valve sections rotatable `inr4 holes orto bores of thecylinder head of the two-cylinderVv Y engine. l, 1 and 2, 2 are the ports of the rotary valve for gas, for supply of the explosive mixture'or gas, respectively theports of the rotary valve 'forthe exhaust gases, for the discharge of the exhaust gases. The valve sections vare constructed as hollow cylindersv formed with diametrically extending passages or ports 4.` The passages/.4, 4 in the adjacent sections are angularly displaced rela;-` tively to each otherv according to the number of cylinders of the engine, for instanceV with two cylinders the passages 4 will be displaced by an angle of whereas with four cylinl ders the angular displacementwilll be 45. 95 Each valve section is, in the` construction shown, formed with a diametrically extending slot 17 whichV extends over the whole length of the section and consequently also through the end walls of the section. The 71W:

slotis indicated by the numeral 17' and in ing corresponding to the cross section of the the construction shown is arranged at right said passage, substantially as described. angles to the direction of the passage 4; of the Signed at Stavanger, Norway, this 28th valve in question. Into the portv17 is inday of October, 1930. serted a plate 18 preferable of resilient ma- JOHAN THORKILDSEN. terial. The plate, has an opening correv j sponding to the section of the passage 4c as best shown in Fig. 4.-. The adjacent valve Y sections are, as above stated connected by belo'ing formed one'section with av dove-tailed f rib 5 andthe adjacent section witlfr'a; eorrei s f 7 sponding groove 6. The grooves 6 and ribs 5 preferably extend diametrically. The outer and driven Asection of the valve has l a similar dove-tail shaped'rib 5 which en-n gages asimilarly shaped groove of a flange I f 80 v7 of a short driving shaft or rpin V8. The shaft 8 iis rotatably mounted inavsocket bearingfv9- tixedrtofthe cylinder head by means of v Y *Y n a'j flan-ge 10 andjvscrew bolts 11. The bearing Y s u .socket 9 serves at the same time as a journal f i pivot-'for adriving gear 12V Whichis loosely mounted on theV socket9 and is driven 4by another gear vn-otvshovvn.v VThe gear 12- is con- Y A .p nected'with thethe shaft 8 by means of' a. n K A u key lfwhich is passedthrongh notches of Y Y v tlfieV` gear 12. and a corresponding slot in the shaft 8 and is'xedY te the latter shaft by,` means of. a pin 14.A This arrangement of `.drivi-nggear has the advantage that themain i v Y y i v i u ystresses are receivedby the socket 9 and that no bending orlateral stresses are transmittedtothe rotary valve. It will be understood, however, that. if Yprete1'-fred the ,valve may be driven by other means than those shown.V Y f j p i Y *Y d v m yThe opposite end of the Vvalve bore is closed. by aeover 15 xed by` screw bolts. This cover is provided With a central openingvvhichvisclosed by ascrew plug 16 provided with a Y square projection. The screw plug can'be j Y l i 1 7 i i easily unscrevved-and serves to enable a key to be inserted into the groove 6 ,in the end y wall of the adjacent valveV section `by means 0;( Whiehthe valve may be turned by hand daring thetting operation. The slot 17 'Y i' j; c ,mi

be produced in any suitableV manner, for instance during the casting operation.4 Y,

Iclaim: j Y v j, Y! LA rotary valve,` morer particularly for s ,l l internal combustion engines, comprisingga n l y Y f f s f l",

cylindrical valve section formed with a valve f f port: andrwtha slot extending over the whole length of thevalverv section, and a plate n serted 'into said slot, substantially as-,and vfor 2. A rotary valve, `more particularly Vfor internal cornlnrston engines, comprising a hollow cylindrical valve'section formed with Y V- Y Y. 50 adl'iametricallyjextending port and provided i Y f ,i Y l. With a diametrically extending slot which. v f Y i l extends at right angles to the direction of the said passage and over the Whole length of the A valve section', and. a plate inserted into said Y p' .GGSIQQSad platebe'lngpfivdedwith anopen- I 'i v u the purposedescribed ,-1 7*', Y Y, 

